After several "non-violent civil disobedience" protests in recent days, Extinction Rebellion group announced on Thursday that it planned to "raise the bar" at the UK's busiest airport, which is expected to be used by nearly 250,000 people today.

The Met said the protests are putting a strain on policing in the capital with officers diverted away from their "core local duties".

Extinction Rebellion has called for non-violent civil disobedience to push the British government to reduce net greenhouse gas emissions to zero by 2025 and to stop what it says is a global climate crisis.

Challenging critics who have said demonstrators are using the protests to have fun, she said: "If you can't have fun whilst saving the planet, what's the point?"

Heathrow Airport, for its part, said that they were working with police to avoid such disturbance.

Protesters have been tying up traffic and setting up impromptu encampments at Waterloo Bridge, Parliament Square and at Oxford Circus in London's busy West End entertainment and shopping district.

Some passengers shouted at the pair to get off whilst police headed for the scene.

Reporters on hand witnessed many younger protesters crying at the threat of being arrested.

Yet only a small number, estimated to be less than 20 - and all of which Extinction Rebellion claims were under the age of 17 years old - made it out to the airport Friday.

"Targeting public transport in this way would only damage the cause of all of us who want to tackle climate change, as well as risking Londoners' safety".

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